coupe's have a different sill profile, and not all their side skirts fit yours.
The best option you're going to have to find is to get a hold of the Rover GTi body kit ones, like on mine. but you WILL need a deeper rear bumper to match, otherwise it'll look crap.
Check out the Mynheer side skirts, the ones they made a long time ago. I thought they would look nice on a 200 series but you will need to fit the coupe front and back bumpers for the rest of the kit. Cost £275 sideskirts £95 rear bumper skirts and £125 front splitter. They will still make this kit for you as I enquired about it 6 months ago. If you look hard you might find a picture on the internet. I'll try and post one up tomorrow.